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Operational Guide

and press STIR. If necessary press the ARROW keys in order to select a

dierent buer value.

4. The (unstable measurement) symbol will be shown on the display until

the reading becomes stable.

5. When the reading is stable and close to the selected buer, the

(unstable measurement) symbol will disappear and the CONFIRM key

will become active.

6. Press CONFIRM to conrm the calibration. The instrument stores the

calibration value and returns to calibration menu, where the date and

time for the pH calibration will be updated.

Note: A buer conrmed during the calibration process is removed from

the list of available buers. If the value measured by the instrument is

not close to the selected buer, a “Wrong Buer” error message will

be shown on the display. Check if the correct buer has been used or

regenerate the pH electrodes by following the Cleaning Procedure. If

necessary change the buer or the electrode.

If the measured oset isn’t within the preset limits (±45 mV), the meter will

display the message “Buer Contaminated” alternatively with ”Electrode

Dirty/Broken”.

If the computed slope isn’t within the

preset limits, the meter will display the

message “Wrong Slope”. If the slope is too

high the symbol will be displayed. If

the slope is too low the symbol will

be displayed.

Electrode

Calibration

Procedure

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Hanna-instruments HI 84529 Bedienungsanleitung Seite 27